I think there's a world of difference between "forgetting" to put something in the supporting papers pack and a report not being available in time. The Transparency Code requires that supporting papers be made available to the public as well as councillors but doesn't define what those supporting papers are and doesn't actually indicate what should be made available to councillors. In my opinion, if a paper is available it should accompany the pack and even sent separately if forgotten but if one is not available, then clearly it can't be sent. The fall back position is that I would ask for an item to be deferred if I didn't think I'd had enough time or information to make an informed decision at the meeting.